RIVERSIDE - As hundreds of tips continued pouring in about the possible whereabouts of Christopher Dorner, Riverside officials on Monday filed charges against the alleged cop killer that could potentially land him the death penalty.

The Riverside County District Attorney's Office filed one murder charge and three counts of attempted murder against the former Los Angeles police officer who is suspected of waging a vendetta against police and their families.

Dorner, 33, also faces two special circumstance allegations of murdering a police officer and discharging a firearm from a vehicle, making him eligible for the death penalty.

Riverside County District Paul Zellerbach said a no-bail arrest warrant was issued for Dorner, 33, who stands accused of fatally shooting Riverside Police Officer Michael Crain and seriously wounding his partner on Feb. 7.

Officials say his killing spree began in Irvine the prior weekend when he killed the daughter of a former LAPD captain who had represented him in departmental hearings, and her fiance.

"This individual, by both his words and conduct, has made it very clear to all of us that every law enforcement officer in Southern California is in danger of being shot or killed," Zellerbach said.

Dorner allegedly fired at the Riverside officers with a rifle from inside his vehicle, authorities said.

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Dorner also stands accused of shooting at two Los Angeles police officers in Corona before the Riverside shooting. The officers were protecting someone on Dorner's "hit list."

One officer was grazed in the head and the other was uninjured, authorities said.

"Now that we have a no-bail warrant out for his arrest, that allows him to be apprehended anywhere - within California, out of state, out of the country, so that assists law enforcement universally to have that warrant in the justice system," Zellerbach said during a news conference at his office.

Riverside DA spokesman John Hall said it is too soon to determine whether Zellerbach will pursue the death penalty against Dorner, but the decision would likely come before a preliminary hearing.

An unprecedented $1 million reward has been offered for information leading to the arrest and conviction of Dorner, who has triggered a statewide manhunt.

The Los Angeles police are now investigating "well over 700" tips from the public in the search for Dorner, officials said at an afternoon press conference at LAPD headquarters.

Those have included calls from people who said they knew Dorner, those who think they spotted him and people predicting where he might go next.

A deputy leaves for patrol from the San Bernardino County Sheriff's Department's Big Bear Station on Feb. 11, 2013, as authorities scale back the manhunt for fugitive ex-cop Christopher Dorner. (GABRIEL LUIS ACOSTA/STAFF PHOTOGRAPHER)

Some false sightings in recent days have triggered massive police responses, including the shutdown of the Twin Towers jail in downtown Los Angeles and the search of a retail complex in Northridge.

The hunt for Dorner continues in the mountain resort city of Big Bear Lake, where his burned pickup was discovered the morning of the shootings in Riverside and Corona.

The search now includes more patrols in the Big Bear Valley, where authorities are checking vacation homes and government-lease cabins in more remote areas, San Bernardino County sheriff's spokeswoman Jodi Miller said.

Miller said 30 additional law enforcement personnel are continuing to look for Dorner and provide additional patrols for the residents of the Big Bear Valley.

He is survived by his wife, 10-year-old son and 4-year-old daughter, Riverside Police Chief Sergio Diaz said at the news conference.

Crain, 34, was an 11-year veteran of the Riverside Police Department and a highly decorated Army veteran who served two tours in war zones, Diaz said.

Crain and his partner started their shift at 10 p.m. last Wednesday, Feb. 6, when they first received information about Dorner; they were allegedly gunned down by the now fugitive around 2 a.m. while sitting at a stoplight at the intersection of Magnolia and Arlington avenues in Riverside.

Diaz said Dorner likely wound up in Riverside on a whim following the shooting of the Los Angeles police officer in Corona, who was protecting an individual that was named in Dorner's manifesto.

Dorner's suspected killing spree began on Feb. 3 with the shooting deaths of Monica Quan and her fiance in Irvine.

Quan was the daughter of retired Los Angeles police captain-turned lawyer Randal Quan, who had represented Dorner in his LAPD termination hearings in 2008.

Neither Zellerbach nor the law enforcement officials from the Riverside, Corona and Los Angeles police departments present during the news conference would disclose if law enforcement officials in the Inland Empire had been targeted by Dorner and were under protection orders.

Also Monday, a school in Arcadia was shut down because one of its staff members has a connection to a potential Dorner target. The official at the Holy Angels school is related to Theresa Evans, the LAPD training officer that Dorner mentioned in his 11,000 word manifesto that he posted on Facebook.

Dorner had accused Evans of beating a suspect, but an LAPD inquiry determined he was lying, leading to his termination.

The school official sent an email to the community over the weekend saying he would stay away from campus as a safety measure, but the school remained closed on Monday.

LAPD spokesman Lt. Andrew Neiman also acknowledged there may be times when local residents see a slower response to non-emergency calls because of the resources deployed in searching for Dorner and protecting the 50 people named in his manifesto as potential targets.

The department had been on tactical alert on and off since Thursday, when Dorner, a former LAPD officer who is the subject of a statewide manhunt, allegedly shot and killed the Riverside police officer.

Neiman said when the department goes on tactical alert, it stops handling routine, low-priority calls.

For example, he explained, if a home is robbed but the burglars have fled so the residents are not in immediate danger, they should not expect squad cars to immediately rush over.

"But if somebody's coming into your house now, you're being robbed, there's need for law enforcement now, that's a 911 that we will respond to," Neiman said.

The department was not on tactical alert Monday. But it is deploying officers so they are ready to mobilize at a moment's notice at a credible sighting of Dorner, he said.